Transformer Iron Core Pressing Bar Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transformer designs face challenges in reducing vibration and noise due to air gaps between stacked steel sheets, as previous methods like using round bars to increase adhesion forces often transfer stresses perpendicular to the stacking direction, leading to reduced overall adhesion and potential separation of sheets.
Innovation Solution
The implementation of a noise reducing means within the iron core's stacked structure, featuring stepped parts with pressing bars having horizontal and vertical surfaces, and an epoxy resin adhesion layer, to concentrate fastening forces in the stacking direction and stabilize the assembly, thereby reducing air gaps and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If round bars are used to increase adhesion forces between steel sheets, then coupling forces at recessed edge portions are improved, but stresses are transferred in perpendicular direction causing reduced overall adhesion and potential sheet separation
Solution Approach 1:
The pressing bar is divided into multiple pressing surfaces (first pressing surface, second pressing surface, third pressing surface) that act on different portions of the steel sheets at different locations. This segmentation allows forces to be distributed in multiple directions simultaneously, preventing stress concentration in the perpendicular direction while maintaining coupling forces in the stacking direction.
Solution Approach 2:
The pressing bar extends in the stacking direction (vertical dimension) and provides pressing forces not only at the top surface but also at side surfaces and lower portions of the steel sheets. This multi-dimensional force application ensures that adhesion is maintained throughout the entire assembly rather than just at single contact points.
2Force
If bindings surround the iron core to press steel sheets, then overall fastening is improved, but stress distribution becomes uneven causing localized sheet separation
Solution Approach 1:
The pressing bar acts as an intermediary between the binding and the steel sheets. It converts the circumferential pressure from the binding into directed pressing forces that are uniformly distributed across multiple surfaces of the steel sheets, preventing localized stress concentrations and sheet separation.
Solution Approach 2:
Different pressing surfaces of the pressing bar are positioned at specific locations (top surface, side surfaces, lower portions) to provide localized pressing forces where needed. This ensures uniform stress distribution across the entire iron core assembly rather than concentrating forces at single points.
Data Source
AI summary
Provided is a transformer having a noise reducing means. The transformer includes: an iron core (P), which is formed by stacking a plurality of steel sheets, and has stepped parts (S) formed at a portion thereof with different widths; and the noise reducing means provided at the stepped parts (S) so as to increase coupling force among the plurality of steel sheets. The noise reducing means includes: pressing bars (30) mounted on the stepped parts (S) of the iron core (P), and having plane-shaped horizontal pressing surfaces (31) in the direction in which the steel sheets are stacked; and a binding (90) for surrounding the outer surface of the iron core (P) including the pressing bars (30), so as to press the pressing bars (30) in the stacking direction of the steel sheets.